Research on the chiral phase transition and hadron properties in QCD at finite temperature and density

有限温度和密度下QCD手性相变和强子性质研究

• 批准号: 16540241
• 负责人: HARADA MASAYASU
• 金额: $ 2.24万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540241/
• 关键词: Quantum Chromo-Dynamics (QCD); Chiral symmetry; low-energy effective theory; vector meson dominance; radiative decay; Schwinger-Dyson equation; Bethe-Salpeter equation; 有限温度相転移; シュウィンーガー・ダイソン方程式; ベーテ・サルピーター方程式; シュビンーガー・ダイソン方程式; D中間子

1. Analysis based on the vector manifestation (VM)I proposed the VM, in which the π and p meson becomes the chiral partner near the chiral phase transition point in hot and/or dense QCD. I performed the following analyses to test the VM experimentally.(1) I showed that the model based on the VM reproduces the mass of newly found D meson.(2) Based on the VM, I studied the dilepton spectrum including the effect of violation of vector dominance. I showed that the predicted spectrum is smaller than the one by the model with the vector dominance.2. Construction of new effective field theory (EFT) including π, p and a_1 mesonsI constructed a new EFT which includes the a_1 meson in addition to π and p mesons. I showed that both masses of p and a_1become light near the chiral phase transition point.3. Proposal of a way for including systematic corrections in an AdS/QCD modelI proposed a way for including systematic corrections in a AdS/QCD mode. I showed that the prediction well reproduces the experiment.4. Analysis on the radiative decays of φ mesonIt is needed to clarify properties of scalar mesons in true-life QCD to construct a new effective model with scalar mesons near the chiral phase transition point. I made an analysis on the φ radiative decays, and showed that the prediction of our model is better than other models.5. Analysis on the chiral phase transition in large flavor QCDI performed an analysis of the large flavor QCD using the Schwinger-Dyson equation and the Bethe-Salpeter equation. I first showed that the mass difference between π^+ and π^0 in real-life QCD. Then, I showed that the mass difference is increased near the chiral phase transition point of large flavor QCD.

1.基于矢量表象(Vm)的分析我提出了Vm，即在热和/或稠密的QCD中，π和p介子在手征相变点附近成为手性伙伴。在实验上，我进行了以下分析来验证该模型：(1)我证明了基于该模型的模型再现了新发现的D介子的质量。(2)基于该模型，我研究了包含破坏矢量优势的双轻子谱。结果表明，预测的光谱比矢量占优的模型预测的光谱要小。建立包括π、p和a_1介子在内的新有效场论，构造了一个除π和p介子外还包括a_1介子的新有效场论。我发现在手性相变点附近，p和a_1的质量都变轻了。一种在ADS/QCD模式中包括系统校正的方法我提出了一种在ADS/QCD模式中包括系统校正的方法。我证明这个预测很好地再现了实验。分析φ介子的辐射衰变需要弄清真实量子CD中标量介子的性质，以建立一个新的具有手征相变点附近标量介子的有效模型。对φ辐射衰变进行了分析，结果表明，该模型的预测效果优于其他模型。大味QCDI的手性相变分析利用Schwinger-Dyson方程和Bethe-Salpeter方程对大味QCD进行了分析。我首先展示了π^+和π^0在现实生活中的质量差异。然后，我发现在大香型QCD的手性相变点附近，质量差增大。

项目成果

Vector manifestation in hot matter : Formulation and predictions

热物质中的矢量表现：公式和预测

• 发表时间: 2004
• 期刊: Progress of Theoretical Physics Supplement 156
• 作者: Kaori;Kaki;Masayasu Harada;Masayasu Harada;Masayasu Harada;Deirdre Black;Masayasu Harada;Masayasu Harada;Masayasu Harada;Masayasu Harada;Masayasu Harada;Deirdre Black;Masayasu Harada;Masayasu Harada;Masayasu Harada;Masayasu Harada;Deirdre Black;Masayasu Harada;Masayasu Harada;Masayasu Harada;Masayasu Harada
• 通讯作者: Masayasu Harada

Chiral doubling of heavy-light hadrons and the vector manifestation of hidden local symmtery

重轻强子的手性倍增与隐局部对称性的矢量表现

• 发表时间: 2004
• 期刊: Physical Review D 70・7
• 作者: Kaori;Kaki;Masayasu Harada;Masayasu Harada;Masayasu Harada;Deirdre Black;Masayasu Harada;Masayasu Harada;Masayasu Harada;Masayasu Harada;Masayasu Harada;Deirdre Black;Masayasu Harada;Masayasu Harada;Masayasu Harada;Masayasu Harada;Deirdre Black;Masayasu Harada
• 通讯作者: Masayasu Harada

Chiral approach to phi radiative decays

phi 辐射衰变的手性方法

• 发表时间: 2006
• 期刊: Physical Review D 73・6
• 作者: Kaori;Kaki;Masayasu Harada;Masayasu Harada;Masayasu Harada;Deirdre Black
• 通讯作者: Deirdre Black

Thermal dilepton production from dropping rho based on the vector manifestation

基于向量表现的下降 rho 产生热双轻子

• 发表时间: 2006
• 期刊: Physical Review D 74・11
• 作者: Kaori;Kaki;Masayasu Harada;Masayasu Harada;Masayasu Harada;Deirdre Black;Masayasu Harada;Masayasu Harada
• 通讯作者: Masayasu Harada

Implications of Holographic QCD in ChPT with Hidden Local Symmetry.

全息 QCD 在具有隐藏局部对称性的 ChPT 中的意义。

• 发表时间: 2006
• 期刊: Physical Review D 74・7
• 作者: M. Tsuboi;T. Tosaki;N. Kuno;K. Nakanishi;T. Sawada;T. Umemoto;S. A. Trushkin;T. Kotani;N. Kawai;Y. Kurono;T. Handa;K. Kohno;T. Tsukagoshi;O. Kameya;H. Kobayashi;K. Fujisawa;A. Doi;T. Omodaka;H. Takaba;H. Sudou;K. Wakamatsu;Y. Koyama,;Masayasu Harada
• 通讯作者: Masayasu Harada